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Old 06-14-2013, 03:46 AM   #1
Junior Member
Join Date: Jun 2013
Location: Cobram
Posts: 10
No water pump on 12 volt

Hi everyone. My wife and I have just purchased our second Jayco van. A 2003 Heritage tandem poptop van. Never having a van that operates on a 240 volt reducing to a 12 volt system before I need some help. We have a 12 volt water pump installed with hot and cold water. Problem I have is that the 12 volt water pump does not work on plain 12 volt. If 240 volt is connected it works fine. I have the power unit under the lounge seat with 3 switches. One is 12 volt, one is the water heater on switch and the other is the 240 volt switch. Previous owner told me about this problem. As the rest of the van works fine on battery power has to be a simple explanation on how to correct it. We have a 12 volt battery installed next to the power unit with a charger that charges the battery while on 240 volt. Is there a switch somewhere to turn it on maybe or does the 240 volt switch need to be on to complete the curcuit? Any thoughts or ideas will be greatly appreciated.
Also I am fitting throughout LED lights to keep the amp usage as low as I can for free camping.

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Old 06-14-2013, 04:59 AM   #2
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Join Date: Sep 2011
Location: King George
Posts: 2,123
Are you operating this TT trailer in the US or Australia. The 240VAC is the normal AC VOLTAGE for their trailers. I suspect you are referering to a JAYCO CARAVAN version TT trailer for use in Australia.

This trailer should have a 12VDC operation using batteries for the times you want to operate it off the power grid. I have never run into a trailer that did not have a 12VDC WATER PUMP. Your 30 AMP Wiring Plan should look something like this except the input AC is 240VAC verses the 120VAC that is used in the US. All of the DC appliances and items should run from 12VDC including your water pump and your ceiling lights etc.. Perhaps all you need is a 12VDC battery hooked up...

I think we are going to need some more info of exactly what you have and are you using this trailer in the US or Austrailia... I'm confused anyway but I am old haha...

Roy Ken

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Old 06-17-2013, 01:32 AM   #3
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Join Date: Jun 2013
Location: Cobram
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Roy Ken

Roy thanks for your reply. Problem solved. I was given the wrong info regarding the 2 switches. On is 12 volt and the other is the 12 volt pump isolator switch. Turned it on with the 12 volt on and you guessed it, works like a charm. A little checking of the wiring and thinking got it solved.' Many thanks. Steve K .
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